He might have to. As far as I can tell they haven’t even started selling individual parts yet. They all just say “Coming soon” on the website. I’m not sure what they are waiting for.
Once they're more established and have money in the bank (hopefully that happens), they can think about ramping up manufacturing and actually keeping inventory before it's been spoken for.
Until then, at least the commodity parts (RAM, storage, WiFi card) can be replaced with off-the-shelf parts bought from NewEgg or wherever.